INFO: task kworker/1:1:26 blocked for more than 143 seconds. Not tainted 6.6.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:1 state:D stack:22080 pid:26 ppid:2 flags:0x00004000 Workqueue: events console_callback Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0xc79/0x30a0 kernel/sched/core.c:6695 schedule+0xe7/0x1b0 kernel/sched/core.c:6771 schedule_timeout+0x278/0x2c0 kernel/time/timer.c:2143 ___down_common kernel/locking/semaphore.c:225 [inline] __down_common+0x327/0x6c0 kernel/locking/semaphore.c:246 down+0x74/0xa0 kernel/locking/semaphore.c:63 console_lock+0x96/0x150 kernel/printk/printk.c:2652 console_callback+0x63/0x4c0 drivers/tty/vt/vt.c:2933 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Showing all locks held in the system: 3 locks held by kworker/1:0/22: #0: ffff88810ae71138 ( (wq_completion)usb_hub_wq ){+.+.}-{0:0}, at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605 #1: ffffc9000017fd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606 #2: ffff888106b92190 (&dev->mutex){....}-{3:3} , at: device_lock include/linux/device.h:992 [inline] , at: hub_event+0x1be/0x4f30 drivers/usb/core/hub.c:5768 2 locks held by kworker/1:1/26: #0: ffff888100070d38 ( (wq_completion)events){+.+.}-{0:0} , at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605 #1: ffffc900001c7d80 (console_work){+.+.}-{0:0}, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606 1 lock held by khungtaskd/29: #0: ffffffff87eac820 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:303 [inline] #0: ffffffff87eac820 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:749 [inline] #0: ffffffff87eac820 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613 2 locks held by getty/2446: #0: ffff8881134c00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000432f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc5/0x1480 drivers/tty/n_tty.c:2206 5 locks held by kworker/1:3/17013: 5 locks held by kworker/0:10/18789: 3 locks held by kworker/1:12/22518: 3 locks held by kworker/1:16/27544: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x26c/0x2d0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xf87/0x1210 kernel/hung_task.c:379 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 26848 Comm: kworker/0:0 Not tainted 6.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Workqueue: events legacy_dvb_usb_read_remote_control RIP: 0010:update_cfs_group+0x1cd/0x240 kernel/sched/fair.c:3774 Code: 41 5e 41 5f e9 14 f6 ff ff 48 99 48 f7 fb eb a6 48 c1 eb 0a b8 02 00 00 00 48 39 c3 48 0f 42 d8 e9 f6 fe ff ff 48 83 c4 08 5b <5d> 41 5c 41 5d 41 5e 41 5f c3 e8 34 d9 73 00 e9 52 fe ff ff e8 2a RSP: 0018:ffffc90000007c40 EFLAGS: 00000082 RAX: dffffc0000000000 RBX: ffff888104fc9c00 RCX: 000000000000007b RDX: 1ffff11022a47b04 RSI: ffff888104fc9c00 RDI: ffff88811523d820 RBP: 0000000000000000 R08: ffff888104fc9c9c R09: fffffbfff12663ca R10: ffffffff89331e57 R11: 0000000000001b7b R12: ffff88811523d780 R13: 0000000000000000 R14: ffff88811523d780 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020002a00 CR3: 0000000133f31000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: enqueue_entity kernel/sched/fair.c:5053 [inline] enqueue_task_fair+0x249/0x1b40 kernel/sched/fair.c:6481 enqueue_task kernel/sched/core.c:2102 [inline] activate_task+0xe9/0x250 kernel/sched/core.c:2132 ttwu_do_activate+0x10d/0x6e0 kernel/sched/core.c:3787 ttwu_queue kernel/sched/core.c:4029 [inline] try_to_wake_up+0x8ab/0x1230 kernel/sched/core.c:4346 hrtimer_wakeup+0x47/0x60 kernel/time/hrtimer.c:1942 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x203/0xc10 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline] __sysvec_apic_timer_interrupt+0x105/0x3f0 arch/x86/kernel/apic/apic.c:1080 sysvec_apic_timer_interrupt+0x89/0xb0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1979 [inline] RIP: 0010:vprintk_emit+0x3aa/0x5f0 kernel/printk/printk.c:2306 Code: 00 4d 85 e4 0f 85 e4 01 00 00 e8 11 20 1c 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 8f 1b 1c 00 48 85 ed 0f 85 f0 01 00 00 f1 1f 1c 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00 RSP: 0018:ffffc90007757ac0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000017 RCX: 0000000000000000 RDX: ffff8881136d3a00 RSI: ffffffff81315524 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 65725f783032396d R12: 0000000000000200 R13: ffff888104e5d700 R14: ffffffff8710a520 R15: ffffc90007757b40 vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2332 m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline] m920x_rc_query+0x496/0x760 drivers/media/usb/dvb-usb/m920x.c:193 legacy_dvb_usb_read_remote_control+0x107/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:123 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304